If you still cannot sign in, contact your technical support team. For details, see the following section, Contact technical support.

What is the difference between my sign-in address and my user ID?

In most cases your user ID and sign-in address are the same, so you can enter the same information in both boxes. If you still cannot sign in, contact your organization’s technical support team. In some organizations, these two values are different.

Lync keeps asking me to sign in after I’ve already signed in

When you first sign in to Lync, you may be asked to enter your sign-in credentials up to three times as Lync connects to your calendar and other online services.

Important: Even if the issue is resolved, notify your organization’s technical support team in order to prevent it from happening again.

When I try to sign in, I get an error message containing the following phrase: Cannot sign in because the server is temporarily unavailable.

You may have an out-of-date version of the Microsoft Online Services Sign-in Assistant. Uninstall the Microsoft Online Services Sign-in Assistant, and then reinstall it from the Office 365 portal at http://portal.office.com/.

If you still cannot sign in, contact your technical support team. For details, see the following section, Contact technical support.

The user’s sign address may have changed recently. Ask the user to reinstall the Online Services Sign-in Assistant from the Office 365 Portal at http://portal.office.com/, and then try signing in again

Gather error logs if requested to do so by technical support

An error log is a record of what happens when a computer encounters a problem. Your technical support team may request that you provide them with error logs to help analyze sign-in or other problems in Microsoft Lync 2010 or Windows.

You may be asked to provide one or more of the following types of logs: